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by coppolaemilio 1389 days ago
This mini-documentary explains it pretty well: https://www.youtube.com/watch?v=J-M98KLgaUU

TL;DW: No-fly zones, costs, and drones not being intelligent enough to detect where they are going to drop off packages. It is cheaper and easier to do the last mile via traditional methods than dealing with all the risks and limitations of flying.